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y UNITED STATES PATENT OFFICE.

JOHN A. IIEANY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THETETER-HEANY DEVELOPING COMPANY, OF SAME PLACE AND CHARLES TON, WESTVIRGINIA.

ELECTRIC-ARC LAM P.

SPECFICATION forming part of Letters Patent No. 678,951, dated July 23,1901. Application iilcd December 13, 1900. Serial No. 39,619. (Nomodel.)

To @ZZ whom, t may concern:

Beit known that I, JOHN A. HEANY, a citi` zen of the United States,residing at the city of Philadelphia, in thecounty of Philadelphia andState of Pennsylvania,have invented certain new and usefullmprovementsin Electric-Arc Lamps, of which. the following is a specification.

My invention has relation to an electricarc lamp, and in such connectionit relates to the construction and arrangement of parts constitutingsuch a lamp.

The principal objects of myinvention are, first, to provide in anarc-lamp a substantially air-tight receptacle wherein the carbons areadapted to be consumed and a feeding mechanism forv the upper carbonlocated within the receptacle and consisting of a leverpivoted at oneend, a clutch-arm pivotedV to the lever intermediate of its ends, amagnet-core projecting into the receptacle, and an armature for saidcore formed on the free end of the lever; second, to provide in anarclamp an upper and lower carbon and feeding mechanism for the uppercarbon, all located within a substantially air-tight receptacle, amagnet located without the receptacle, and a core for said magnetprojecting into the receptacle and adapted to f control the feedingmechanism for the Lipper carbon; third, to provide in an arc-lamp a tubewherein the upper carbon is adapted to slide and located in the maincircuit, a clip comprising two semitubular wings pivotally connected toclamp the upper end of the upper carbon, said clip adapted to slide inthe tube, and aspring connecting the clip with the tube, and, fourth, toprovide in an arc-lamp a removable ree sistance piece or pieces wherebythe use ot' a resistance-coil is obviated.

The nature and scope of my invention will be more fully understood fromthe following description, taken in connection with the accompanyingdrawings,forming part hereof, in which- Figure l is a vertical sectionalview of an arc-lamp embodying main features of my invention. Fig. 2 isan underneath plan View ofthe feeding mechanism for the upper carbon.Fig. 3 Ais a front elevational view, enlarged and partly broken away, ofthe resistance removed from the lamp; and Figs. 4 and 5 are enlargeddetail views of the clip or holder for the yupper carbon.

Referring to the drawings, ct represents the upper and I) the lowercarbon. The abuttingends of these carbons are inclosed in a globe d,having a plate or root` CZ iitted to the upper end of the globe cl toform an air-tight receptacle. From the roof or plate d projects upward atube c, the upper end of which is provided with a cap c. Y In the tube ethe upper carbon a is adapted to slide. The lower carbon b is supportedwithin the globe d by means of a holder b', suspended from and alsoinsulated from the roof-plate d. The upper carbon a is suspended from aclip or holder f, consisting of two semitubular wings f', pivotallyconnected, as atf?, to inclose the carbon. The clip or holder f issupportedI by a coiled spring gdepending from the cap e' and inelectrical connection therewith. The feeding mechanism for the uppercarbon o; comprises a lever-arm h, pivoted, as at h', to the under faceof the roof-plate d and limited in its downward movement away from theplate d by means of the set-screw 71,2, working in the slot or recesshsin the arm h. The free end of the lever-arm h carries a`n armature h4,formed, preferably, of a ring of soft iron. Projecting through theroof-plate d', adjacent to the ring-armature h4, is a core m, ofpreferably conical shape. is magnetized when a magnet m', locatedoutside the globe d and on the roof d@ is energized. Intermediate of thepivoted and armature ends of the leverh is pivoted or hinged a magneticclutch n, vcomprising a clampingface n', adapted to bite into the carbona, anda tailpiece n2,adapted to be attracted toward the armature h4 whensaid armature is attracted by the core m of the magnet m. If now themagnet m be energized, its core m will first vmagnetize and then attractthe armature h4. The magnetization of the armature h4 will cause thetailpiece n2 to be attracted, thereby causing the clamp n to bite intothe carbon a to fasten said carbon to the lever h. The subsequent upwardmovement of the lever h toward the core m will then serve to lift theThis core m IOO carbon a away from the carbon h until the arc betweensaid carbons is disrupted.

The circuit through the lamp is as follows: To a clamping or bindingpost p one end of the main line is secured. The current then passes bywire p into the magnet m', Afrom which it emerges by wire p2 in electricengagement with the roof-plate CZ. This plate d is in electrical contactwith the tube e and 'cap e', and hence the current passes from wire p2to the plate d and tube c to the cap e'. The current then proceeds bythe spring g from the cap c' to the clip or holderf and to the uppercarbon a. It then passes to the lower -carbon ZJ and its holder h to awire p3 and thence through a removable resistance-piece r to a wire p4and thence by the bindingscrew p5 to the return-wire of the maincircuit. The removable resistance r constitutes one of the main featuresof my invention. It comprises a tube r', of glass, porcelain, or similarnon-conducting material, sealed at both ends and having the airexhausted from its interior. A strip of carbon r2 or similar resistancematerial traverses the interior of the tube r and has its endsprojecting through the sealed ends of said tube r and in electricconnection with metallic cap-pieces r3, secured to the sealed ends otthe tube. On the roof-plate CZ is located a socket-piece r4 in electricconnection with the wire p3, but insulated from the roof-plate CZC Inthis socketpiece r4 the lower capped end of the resistance r is adaptedto be inserted. In an extension or bracket 715 of the tube c is alsoadjustably supported a socket-piece r,insulated from the extension orbracket 15, butin electric contact with the wire p4. A spring ri servesnormally to depress the socket-piece r6 toward the socket r4; but thesocket r may be elevated against the tension of the spring r? to permitthe upper capped end or resistance i to be slipped into or out of thesocket r, Of course the resistance r may be of any value desired, and asit can be easily removed and replaced in the circuit by other pieces ofmore or less value the strength of the current passing through the lampmay be readily controlled and all danger of burning out can be avoided.

The simple construction and cheap character of the resistance r,together with the fact that it may be removed and replaced, serve tomake the lamp much cheaper and better than a lamp wherein many pounds ofcoiled wire are used as a resistance.

Having thus described the nature and objects oi my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

I. In an electric-arc lamp, a substantially air-tight receptacle whereinthe carbons are adapted to be consumed, and a feeding mechanism for theupper carbon located wholly within the receptacle and comprising a leverpivoted at one end, a magnetic clutch-arm pivoted to the leverintermediate of its ends and adapted to bind or release the upper carbonto or from the lever, a magnet-core projecting into the receptacle andan armature for said core formed on the free end of said lever,substantially as and for the purposes described.

2. In an electric-arc lamp, a tube wherein the upper carbon is adaptedto slide and included in the main circuit, a clip comprising twosemitubular wings pivoted together to receive and hold the upper carbon,said clip adapted to slide in said tube, and a spring adapted to supportsaid clip and connecting said clip to said tube, substantially as andfor the purposes described.

3. In an electric-arc lamp, a tube wherein one ot the carbons is adaptedto slide and included in the main circuit, a clip, comprising twosemitubular wings pivoted together to receive and hold the carbon, saidclip adapted to slide in said tube, and means for connecting` said clipelectrically with said tube and for supporting said clip, while soconnected, in said tube, substantially as and for the purposesdescribed.

et. In an electric-arc lamp, an upper and a lower carbon,-means forfeeding one of said carbons toward the other, a main circuit, whereinthe two carbons are included, a binding-post to which one wire of themain circuit is secured, a socket-piece located adjacent to said postand in electrical connection therewith, a second socket-piece locatedadjacent to and in electric connection with one of the carbons, and aresistance-piece removably secured in said socket-pieces and bridgingthe same, substantially as and for the purposes described.

5. In an electric-arc lamp, an upper carbon and a lower carbon, meansfor adjusting said carbons with relation to each other, said means,comprising a feeding mechanism for one ot' said carbons, an inclosedresistance included in and bodily removable from the main circuit inwhich said carbons are included, the same consisting of a sealed tube olnonconducting lnaterial having a vacuum in its interior, a strip ofcarbon or similar resistance material traversing said tube, and metalliccaps secured to either sealed end of said tube and in electricconnection with said resistance, said resistance interposed in the maincircuit between the fixed and movable car bons, substantially as andAfor the purposes described.

In testimony whereof I have hereunto set my signature in the presence oftwo subscribing witnesses.

J OIIN A. IIEANY.

Witnesses J. WALTER DoUcLAss, Tuoi/Ins M. SMITH.

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